Abstract: We describe the morphology and histological structure of the teeth of the hybodontoid shark Lonchiodion humblei from the Upper Triassic Chinle Group in Texas and New Mexico. The five morphotypes (symphyseal, mesial, anterolateral, lateral and posterior) previously applied to the teeth of other species of Lonchidion are
applicable to L. humblei, which exhibits moderate heterodonty. The histological structure of the teeth also changes slightly posteriorly through the dentition. The function of the teeth of L. humblei was probably differentiated, from cutting in the symphyseal and mesial positions to crushing in the lateral and posterior ones.

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Publication

Heckert, A. B., Ivanov, A., and Lucas, S. G., (2007) Dental morphology of the hybodontoid shark Lonchidion humblei Murry from the Upper Triassic Chinle Group: New Mexico Museum of Natural History and Science Bulletin, v. 41 (The Global Triassic) , p. 45-48. Archived in NC DOCKS with permission of editor. The version of record is available at: http://econtent.unm.edu/